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The slope along Riverside Ave has gone through much change over the past 100 years or so. Last Halloween, a large rain event caused a slide to occur. Below, I ran different numbers through a sensitivity analysis to see what characteristics of the slope combined with the rainstorm might have led to the slide.
The slope along Riverside Ave has gone through much change over the past 100 years or so. Last Halloween, a large rain event caused a slide to occur. Below, I ran different numbers through a sensitivity analysis to see what characteristics of the slope combined with the rainstorm might have led to the slide.
Ranges Analyzed:
Ranges Analyzed:
Slab Thickness: 2-3m
Slab Thickness: 2-3m
Alpha: 20-30 degrees
Alpha: 20-30 degrees
Cohesion: 500-6000 Pa
Cohesion: 500-6000 Pa
Saturation Depth: 0.5-1.5m
Saturation Depth: 0.5-1.5m
Many factors may have led to the slope instability of Riverside Avenue. Land-use change has increased the surface area of impermeable surfaces, causing higher immediate runoff levels post-rainstorm. More runoff coming off of Riverside Ave likely increased the saturation of the slope's soil, thus increasing the buoyancy force and decreasing normal force of the slope. In addition, the clearing of vegetation over time for development further decreased the soil stability which made conditions for slides even more likely. Dumping of various wastes on the upper portions of the slope have probably increased the angle of the slope; based on the sensitivity analyses above, it seemed as though the Failure Plane angle was the most influential on slide occurrence.
Many factors may have led to the slope instability of Riverside Avenue. Land-use change has increased the surface area of impermeable surfaces, causing higher immediate runoff levels post-rainstorm. More runoff coming off of Riverside Ave likely increased the saturation of the slope's soil, thus increasing the buoyancy force and decreasing normal force of the slope. In addition, the clearing of vegetation over time for development further decreased the soil stability which made conditions for slides even more likely. Dumping of various wastes on the upper portions of the slope have probably increased the angle of the slope; based on the sensitivity analyses above, it seemed as though the Failure Plane angle was the most influential on slide occurrence.
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